New cage lactones were synthesized by the photocyclization of the tricyclodienolactones 1a, 1b, 2 which were available from the Diels‐Alder reactions of 2‐pyrones with p‐benzoquinones or norbornadiene. Retro‐Diels‐Alder reactions of cross‐adducts between 2‐pyrone‐mono‐adducts and p‐benzoquinone were also described.
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Shimo et al. (1992) studied this question.
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